Photochromic Dye Intermediate Indoline from China
1,3,3-Trimethyl-2-methyleneindoline serves as a photochromic dye intermediate explicitly listed in HTS 2933.99.08.00. This nitrogen-heterocyclic compound reacts with spiropyrans to create color-changing materials for lenses and inks. Its aromatic indoline structure defines its Chapter 29 classification.
Duty Rate — China → United States
112.5%
Rate breakdown
9903.04.60100%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include intended end-use declaration specifying dye intermediate function
• Provide stability data showing no inherent color (distinguishing from Chapter 32)